20038391 has 8 divisors (see below), whose sum is σ = 20811600. Its totient is φ = 19270720.

The previous prime is 20038373. The next prime is 20038411. The reversal of 20038391 is 19383002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20038391 - 2⁶ = 20038327 is a prime.

It is a super-2 number, since 2×20038391² = 803074227737762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20038391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20038321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6920 + ... + 9378.

It is an arithmetic number, because the mean of its divisors is an integer number (2601450).

Almost surely, 2^20038391 is an apocalyptic number.

20038391 is a deficient number, since it is larger than the sum of its proper divisors (773209).

20038391 is a wasteful number, since it uses less digits than its factorization.

20038391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 20038391 is about 4476.4261414660. The cubic root of 20038391 is about 271.6153326586.

The spelling of 20038391 in words is "twenty million, thirty-eight thousand, three hundred ninety-one".